A 68-year-old man with a history of anterior wall myocardial infarction presents with recurrent episodes of sudden loss of consciousness without preceding warning symptoms. He remains unconscious for 15–20 seconds, during which observers note pallor followed by reactive facial flushing as he regains consciousness. An ECG during one episode shows AV dissociation with more P waves than QRS complexes and no consistent PR relationship. The rhythm shown corresponds to the condition marked **B** in the diagram. Which of the following is the most appropriate definitive management?
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